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자동차용 마찰재에서 철산화물이 마찰특성에 미치는 영향에 관한 연구
조근형(KeunHyung Cho),장호(Ho Jang) 한국트라이볼로지학회 2004 한국트라이볼로지학회 학술대회 Vol.39 No.-
The relationship between friction characteristics and iron oxides at the sliding interface was investigated. Three friction materials containing iron, magnetite (Fe₃O₄) or hematite (Fe₂O₃) were manufactured and friction tests were performed on gray cast iron disks to evaluate the friction coefficient as a function of sliding speed (μ-ν). In-situ noise spectrum analyzer was employed to compare noise propensity during friction tests. Results show that the specimens with magnetite are more sensitive to velocity than those with iron or hematite. The specimens containing magnetite and hematite generated noise with different peaks in the spectrum. The difference in the peak frequency seems attributed to the different surface aggressiveness of iron oxides and intermittent changes of real contact area at the sliding interface during sliding. Surface morphology and roughness of the counter disc after the tests are also consistent with the aggressiveness of iron oxides.
Dynamic Brake System 유압 시뮬레이션 모델 개발
전재영(Jaeyoung Jeon),서정욱(Jungeuk Seo),조근형(Keunhyung Cho),최욱진(Wookjin Choi) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
The IDB(Integrated Dynamic Brake) is a system designed to control the braking force of a vehicle in order to decelerate the vehicle speed according to the intention of the driver, not the service brake system. The IDB is a system that integrates the separate Master, Booster, and ESC(Electronic Stability Control). Since the IDB is a complicate integrated system, behavior of each component has impact on the system performance. For this reason, predicting the failure of main components in the process of developing the system has become an important challenge. This study introduces an analysis model that verifies the flow of hydraulic pressure in the failure situation of the solenoid valves, which are important components in the IDB. Therefore, this study aims to analyze IDB system behavior through preliminary predictions of the two situations of permanent open and close in the solenoid valve